Measurement of exclusive ρ+ρ− production in high- Q2 two-photon collisions at LEP
P. AchardUniversity of Geneva, CH-1211 Geneva 4, SwitzerlandО. АдрианиUniversity of FlorenceM. Aguilar-BenítezCentro de Investigaciones Energéticas , Medioambientales y Tecnológicas , CIEMAT , E-28040 Madrid , SpainJ. Alcaraz MaestreCentro de Investigaciones Energéticas , Medioambientales y Tecnológicas , CIEMAT , E-28040 Madrid , SpainG. AlemanniUniversity of Lausanne, CH-1015 Lausanne, SwitzerlandJ. AllabyEuropean Laboratory for Particle Physics, CERN, CH-1211 Geneva 23, SwitzerlandA. AloisioINFN, Sezione di Napoli and University of Naples, I-80125 Naples, ItalyMariagrazia AlviggiINFN, Sezione di Napoli and University of Naples, I-80125 Naples, ItalyH. AnderhubEidgenössische Technische Hochschule, ETH Zürich, CH-8093 Zürich, SwitzerlandVladimir AndreevLouisiana State University, Baton Rouge, LA 70803, USAF. AnselmoUniversity of BolognaA. ArefievInstitute of Theoretical and Experimental Physics, ITEP, Moscow, RussiaT. AzemoonUniversity of Michigan, Ann Arbor, MI 48109, USAT. AzizTata Institute of Fundamental Research, Mumbai (Bombay) 400 005, IndiaP. BagnaiaINFN, Sezione di Roma and University of Rome, “La Sapienza”, I-00185 Rome, ItalyA. BajoINFN , Sezione di Napoli and University of Potenza , I-85100 Potenza , ItalyG. BaksayFlorida Institute of Technology, Melbourne, FL 32901, USAL. BaksayFlorida Institute of Technology, Melbourne, FL 32901, USAS.V. BaldewUniversity of AmsterdamSw. BanerjeeTata Institute of Fundamental Research, Mumbai (Bombay) 400 005, IndiaA. Barczykz Florida Institute of Technology , Melbourne , FL 32901 , USAR. BarillèreEuropean Laboratory for Particle Physics , CERN , CH-1211 Geneva 23 , SwitzerlandP. BartaliniINFN, Sezione di Roma and University of Rome, "La Sapienza", I-00185 Rome, ItalyM. BasileUniversity of Michigan, Ann Arbor, MI 48109, USAN. Batalovaw University of Lausanne , CH-1015 Lausanne , SwitzerlandR. BattistonINFN , Sezione di Perugia and Università Degli Studi di Perugia , I-06100 Perugia , ItalyA. BayF. BecattiniInstitute of Theoretical and Experimental Physics, ITEP, Moscow, RussiaU. BeckerEidgenössische Technische Hochschule, ETH Zürich, CH-8093 Zürich, SwitzerlandF. BehnerInstitute of Theoretical and Experimental Physics, ITEP, Moscow, RussiaL. BellucciUniversity of AmsterdamR. BerbecoTata Institute of Fundamental Research, Mumbai (Bombay) 400 005, IndiaJ. BerdugoCentro de Investigaciones Energéticas , Medioambientales y Tecnológicas , CIEMAT , E-28040 Madrid , SpainP. BergesINFN, Sezione di Roma and University of Rome, "La Sapienza", I-00185 Rome, ItalyB. BertucciTata Institute of Fundamental Research, Mumbai (Bombay) 400 005, IndiaB.L. Betevw University of Lausanne , CH-1015 Lausanne , SwitzerlandM. BiasiniUniversity of Michigan, Ann Arbor, MI 48109, USAM. BigliettiUniversity of Michigan, Ann Arbor, MI 48109, USAA. BilandJ.J. BlaisingCarnegie Mellon UniversityS.C. BlythCarnegie Mellon University , Pittsburgh , PA 15213 , USAG. J. BobbinkNational Institute for High Energy Physics , NIKHEF , and University of Amsterdam , NL-1009 DB Amsterdam , The NetherlandsA. BöhmIII. Physikalisches Institut , RWTH , D-52056 Aachen , GermanyL. BoldizsárCentral Research Institute for Physics of the Hungarian Academy of Sciences , H-1525 Budapest 114 , HungaryB. BorgiaTata Institute of Fundamental Research, Mumbai (Bombay) 400 005, IndiaS. BottaiTata Institute of Fundamental Research, Mumbai (Bombay) 400 005, IndiaD. BourilkovNational Institute for High Energy Physics, NIKHEF, and University of Amsterdam, NL-1009 DB Amsterdam, The NetherlandsM. BourquinUniversity of Michigan, Ann Arbor, MI 48109, USAS. BracciniUniversity of Geneva , CH-1211 Geneva 4 , SwitzerlandJ.G. BransonF. BrochuInstitute for Theoretical and Experimental PhysicsJ.D. BurgerMassachusetts Institute of Technology , Cambridge , MA 02139 , USAW.J. BurgerINFN, Sezione di Perugia and Università Degli Studi di Perugia, I-06100 Perugia, ItalyX.D. CaiMassachusetts Institute of Technology , Cambridge , MA 02139 , USAM. CapellUniversity of Michigan, Ann Arbor, MI 48109, USAG. Cara RomeoFlorida Institute of Technology, Melbourne, FL 32901, USAG. CarlinoFlorida Institute of Technology, Melbourne, FL 32901, USAA. CartacciINFN, Sezione di Firenze and University of Florence, I-50125 Florence, ItalyJ. CasausCentro de Investigaciones Energéticas , Medioambientales y Tecnológicas , CIEMAT , E-28040 Madrid , SpainF. CavallariInstitute of Theoretical and Experimental Physics, ITEP, Moscow, RussiaN. CavalloTata Institute of Fundamental Research, Mumbai (Bombay) 400 005, IndiaC. CecchiM. CerradaUniversity of Michigan, Ann Arbor, MI 48109, USAM. ChamizoUniversity of Geneva , CH-1211 Geneva 4 , SwitzerlandY. H. ChangM. ChemarinInstitute of Nuclear Physics of LyonK. F. ChenG. ChenFlorida Institute of Technology, Melbourne, FL 32901, USAG.M. ChenInstitute of High Energy Physics , IHEP , 100039 Beijing , ChinaH. F. ChenChinese University of Science and Technology , USTC , Hefei , Anhui 230 029 , ChinaH.S. ChenInstitute of High Energy PhysicsG. ChiefariFlorida Institute of Technology, Melbourne, FL 32901, USAL. Cifarellial University of Californa , Riverside , CA 92521 , USAF. CindoloInstitute of Theoretical and Experimental Physics, ITEP, Moscow, RussiaI. ClareMassachusetts Institute of Technology , Cambridge , MA 02139 , USAR. ClareTata Institute of Fundamental Research, Mumbai (Bombay) 400 005, IndiaG. CoignetLaboratoire d’Annecy de Physique des ParticulesN. ColinoTata Institute of Fundamental Research, Mumbai (Bombay) 400 005, IndiaS. CostantiniTata Institute of Fundamental Research, Mumbai (Bombay) 400 005, IndiaB. De La CruzCentro de Investigaciones Energéticas , Medioambientales y Tecnológicas , CIEMAT , E-28040 Madrid , SpainS. CucciarelliINFN , Sezione di Perugia and Università Degli Studi di Perugia , I-06100 Perugia , ItalyJ.A. van DalenEuropean Laboratory for Particle Physics, CERN, CH-1211 Geneva 23, SwitzerlandR. de AsmundisTata Institute of Fundamental Research, Mumbai (Bombay) 400 005, IndiaP. DéglonUniversity of Geneva , CH-1211 Geneva 4 , SwitzerlandJ. DebreczeniCentral Research Institute for Physics of the Hungarian Academy of Sciences , H-1525 Budapest 114 , HungaryA. DegréLaboratoire d'Annecy-le-Vieux de Physique des Particules , LAPP , IN2P3-CNRS , BP 110 , F-74941 Annecy-le-Vieux cedex , FranceK. DehmeltFlorida Institute of Technology, Melbourne, FL 32901, USAK. DeitersFlorida Institute of Technology, Melbourne, FL 32901, USAD. della VolpeUniversity of AmsterdamE. DelmeireTata Institute of Fundamental Research, Mumbai (Bombay) 400 005, IndiaP. DenesINFN, Sezione di Roma and University of Rome, "La Sapienza", I-00185 Rome, ItalyF. DeNotaristefaniINFN , Sezione di Roma and University of Rome , "La Sapienza" , I-00185 Rome , ItalyA. De Salvoan University and INFN , Salerno , I-84100 Salerno , ItalyM. DiemozUniversity of Michigan, Ann Arbor, MI 48109, USAM. DierckxsensNational Institute for High Energy Physics , NIKHEF , and University of Amsterdam , NL-1009 DB Amsterdam , The NetherlandsC. DionisiINFN , Sezione di Roma and University of Rome , "La Sapienza" , I-00185 Rome , ItalyM. Dittmaran University and INFN , Salerno , I-84100 Salerno , ItalyA. DoriaINFN , Sezione di Napoli and University of Naples , I-80125 Naples , ItalyM.T. DovaNortheastern University , Boston , MA 02115 , USA
2004lv
ABI
Annotatsiya
Exclusive ρ+ρ− production in two-photon collisions involving a single highly-virtual photon is studied for the first time with data collected by the L3 experiment at LEP at centre-of-mass energies 89<s<209GeV with a total integrated luminosity of 854.7pb−1. The cross section of the process γγ*→ρ+ρ− is determined as a function of the photon virtuality, Q2, and the two-photon centre-of-mass energy, Wγγ, in the kinematic region: 1.2<Q2<30GeV2 and 1.1<Wγγ<3GeV. The ρ+ρ− production cross section is found to be of the same magnitude as the cross section of the process γγ*→ρ0ρ0, measured in the same kinematic region by L3, and to have similar Wγγ and Q2 dependences.
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